SsangYong Rexton. Service manual — part 38
DI02-43
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
ENGINE HOUSING
DI ENG SM - 2004.4
Y220_02112
<Example of DMF operation>
Y220_02113
System Characteristics
Function
• Filters irregularities of engine: The secondary flywheel
operates almost evenly so does not cause gear noises
• The mass of the primary flywheel is less than
conventional flywheel so the engine irregularity
increases more (less pulsation absorbing effect)
• Transmission protection function: Reduces the load to
powertrain (transmission) by blocking the irregularity
of engine
Characteristics of DMF
• Reduced vibration noise from the powertrain by blocking
the torsional vibrations
• Enhanced vehicle silence and riding comforts: reduced
engine torque changes
• Reduced shifting shocks
• Smooth acceleration and deceleration
Structure
Function and characteristics
• When the output changes from the engine is high during
power stroke (
): The damper absorbs the shocks to
reduce the changes to transmission.
• When the output changes from the engine is low during
compression stroke (
): The damper increases the torque
changes to clutch.
Advantages of DMF
• Improved torque response by using 3-stage type spring:
Strengthens the torque response in all ranges (low,
medium, and high speed) by applying respective spring
constant at each range.
• Stable revolution of the primary and secondary wheel
by using planetary gear: Works as auxiliary damper
against spring changes
• Less heat generation due to no direct friction against
spring surface: Plastic material is covered on the spring
outer surface
• Increased durability by using plastic bushing (extends
the lifetime of grease)
<Torque change curve of engine and drive shaft>
Angular acceleration amplitude [1/s
2
]
Speed [rpm]
Conventional system
Speed [rpm]
DMFW
Transmission
Engine
Transmission
Engine
DI02-44
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
ENGINE HOUSING
DI ENG SM - 2004.4
Y220_02114
1. Piston
2. No.1 compression ring
3. No.2 compression ring
4. Oil ring
5. Piston pin
6. Snap ring
PISTON AND CONNECTING ROD
Description
Cylinder bore diameter
Piston outer diameter (D1)
Clearance between bore and piston
Piston cooling gallery
Pin offset
Compression ratio
Length of piston pin
Material of top ring / coating
Tightening torque of connecting rod bolt
Permissible weight difference of connecting rod
Thickness of connecting rod bearing (Red)
Thickness of connecting rod bearing (Yellow)
Thickness of connecting rod bearing (Blue)
D27 DT ENG
φ 86.2
(0~0.018)
mm
φ 86.133
(±0.009)
mm
74
Applied
N/A
18 : 1
71.2 mm
Steel / Gas nitride
40 ± 5.0 Nm, 90° + 10°
4 g
1.806 ~ 1.809 mm
1.809 ~ 1.812 mm
1.812 ~ 1.815 mm
DI02-45
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
ENGINE HOUSING
DI ENG SM - 2004.4
Y220_02115
PISTON RING
1. No.1 compression ring
2. No.2 compression ring
3. Oil ring
5. Coil spring and oil control ring
6. Hook spring
Replacement of Piston Ring
• Measure piston ring end play.
- Piston ring end play (mm)
1st groove: 0.20 ~ 0.35
2nd groove: 0.20 ~ 0.35
3rd groove: 0.20 ~ 0.40
- Clearance between piston ring and piston (mm)
1st compression ring: 0.075 ~ 0.119
2nd compression ring: 0.050 ~ 0.090
3rd oil ring: 0.030 ~ 0.070
• Install the piston so that “Y” marking on piston head is
facing in the direction of travel. Arrange the piston ring
ends to be 120° apart.
• Adjust the hook spring joint in the oil ring 180 ° away from
the ring end.
Y220_02116
DI02-46
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
ENGINE HOUSING
DI ENG SM - 2004.4
Y220_02117
CYLINDER INNER DIAMETER AND PISTON SIZE
(Unit : mm)
Engine
D27DT
Code
A
X
B
+ 5
+ 10
Used piston
A or X
A, B or X
B or X
+ 5
+ 10
Cylinder Diameter
86.200 ~ 86.206
86.206 ~ 86.212
86.212 ~ 86.218
86.250 ~ 86.260
86.300 ~ 86.310
Piston Diameter
86.124 ~ 86.130
86.129 ~ 86.137
86.136 ~ 86.142
86.167 ~ 86.181
86.217 ~ 86.231
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